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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| G500 lockers not working
pump is running
center diff is locking (control light)
have switch pack for individual engagement
front and rear diff locks are not engaging (no control light - not physical engagement)
where do I look first? |
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| RE: G500 lockers not working
My guess would be that there is something verrückt with your modified switch pack. Do you have a spare you can try? |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| RE: G500 lockers not working
You should be able to hear the vacuum valves clicking when you push the buttons. If so, then check the vacuum at the valve tree. If not, try applying 12V directly to the valves. Maybe they got gummed up with something.
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| RE: G500 lockers not working
will check the valves |
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| RE: G500 lockers not working
all valves are clicking
with front and center switched on, the pump stops when max pressure is reached
not so the rear
where do I look first? |
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koly
Elite Veteran
Date registered: Jul 2006
Location: Scottsdale, AZ USA
Vehicle(s): 2000 G500
Posts: 823
| RE: G500 lockers not working
4x4abc - 8/22/2014 8:17 PM
all valves are clicking
with front and center switched on, the pump stops when max pressure is reached
not so the rear
where do I look first?
Solenoids.
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| RE: G500 lockers not working
Trace the path of the vacuum lines down under the truck and find where they go into the hydraulic amplifier gizmos. Chances are that they will have disconnected down there (happened to me). With the lockers engaged (yellow light) you should have vacuum on each line. If not, start following back until you find the fault. If you do have vacuum down there, then the fault lies in the hydraulic parts. It is possible that the supply has been interrupted by a kinked pipe. Lots of places to look for faults.
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| RE: G500 lockers not working
I love this forum. Thanks guys! |
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fernweh
Date registered: Apr 2006
Location: Calabasas, CA - Centenario, BCS - Luebeck, Germany
Vehicle(s): Few Mercedes-Benz, a Toyota Amphibious and a Vespa
| RE: G500 lockers not working
Harald,
I know it is a chore to work right now in the summer heat down there.....
Take the locking cylinder (on each axle) apart, and clean out the sludge,
Make sure the pistons are smooth, lubricate with some ATE grease and bleed the system.
I had to replace one of the intensifiers on my adventurewagen, the vacuum connector was broken off.
Good Luck
Saludos,
Karl |
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| RE: G500 lockers not working
I am already exhausted after making my coffee in the morning
driving the car onto the pit requires adventure trip preparation
it's only 97F at the moment - but combined with 80% humidity it's a killer
this post was already too much - will have to take a nap
should I go in the pool first?
 (meerjungfrau-1k.jpg)
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 meerjungfrau-1k.jpg (298KB - 0 downloads)
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| RE: G500 lockers not working
all kidding aside - it is very very hot here
a few days ago I set out to take some pictures of an abandoned communications site
somewhere out in the Baja wilderness
the hill was maybe 700 ft high
a gently sloped dirt road to the top less than a mile long
because of a roadblock it's not drivable
so it's a 30 minute hike
usually
I could not make it
gave up after 500 yards
first time in my life I had to give up
the fact that my (Mexican) dog refused to continue told me, it was time to turn around
rain had transformed many parts of the desert into mud lakes (beautiful though)
that's when I found out that I only had the center lock available
Edited by 4x4abc 8/24/2014 12:59 PM
 (park.jpg)
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park.jpg (392KB - 1 downloads)
DSC_4161-asf.jpg (319KB - 1 downloads)
DSC_4129-asf.jpg (186KB - 1 downloads)
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thebigblue
Date registered: Jan 2012
Location:
Vehicle(s):
| RE: G500 lockers not working
pool first I would say .... |
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So-Cal G
Regular
Date registered: May 2011
Location: So-Cal
Vehicle(s): G500 2002
Posts: 93
| Re: G500 lockers not working
I would opt for the pool as well.
To get the front to lock in did you try turning the wheels full lock left and then full lock right while engaging the switch on the roll?
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NHDave
Extreme Veteran
Date registered: Dec 2013
Location: Seacoast NH.
Vehicle(s): 2004 AMG
Posts: 465
| Re: G500 lockers not working
I'm such a GOOG here, so be patient?
See if you can access the three inline check valves, behind the solenoid cluster. Your driving dusty roadways.
Remove, drop some oil, (oil will collect dust and cake it) or flush out with spray silicone?
My venture with all this vacuum line locker junk was expensive, buying this and that....After all said an done, it was the cheap little check valves!
I have a brand new intensifier, sitting on the shelf, I'll send it to you, if you really think that's what it is?
Now think about it, as you swim!
Enjoy your time away?
DNH |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| Re: G500 lockers not working
If the check valves are getting dirty that means that the inlet filters are missing. The system is powered by vacuum generated by the engine. Ambient air forms the other side of the pressure differential and each air inlet should have little air filters on it. They look a bit like aquarium air bubblers. I suppose the the filters themselves could become so plugged up that they interfere with operation.
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| Re: G500 lockers not working
David,
I'll get the truck on a pit soon and will report about the possible need of an intensifier
it is so hot and humid here that mañana is your bets friend
mañana only means "not today"
it could mean tomorrow - but it does not have to |
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| Re: G500 lockers not working
Jesse,
"turning the wheels full lock left and then full lock right" is almost a guarantee that the locker will NOT engage
a locker needs an rpm difference between left and right
if you start creating that by turning left and then turn right before the locker had a chance to engage, you are turning the rpm difference back to zero
a slow turn in either direction will net the best result
Edited by 4x4abc 8/27/2014 1:30 AM
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| Re: G500 lockers not working
well, I screwed up big time!
should have used my glasses
one of the connectors was off
the rubber had cracked
temp fixed it with super glue
 (lose.jpg)
 (crack.jpg)
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lose.jpg (208KB - 1 downloads)
crack.jpg (125KB - 1 downloads)
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Titus Pullo
Elite Veteran
Date registered: May 2007
Location: Ottawa, ON, Canada
Vehicle(s): '90 Wolf 240GD, '06 G270 CDI.
Posts: 1010
| Re: G500 lockers not working
ha thats funny - exactly the same problem as I had in the winter: http://www.pointedthree.com/disc/forums/showthread.php?tid=21390&po... |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| RE: G500 lockers not working
Up until the V engines were installed in the G, the left side of the engine compartment was relatively cool. So MB wisely put all the suceptable parts over there. You V8 (and V6) drivers should carefully look at the vacuum lines, crank position sensor and the tubing for the locker reservoir.
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